Cause and effect human life in gentics influence

The heritability of longevity appears to be low, as it aggregates in families rather than segregating. Genes implicated in longevity probably affect responses to life-threatening factors, rather than directly regulating maximum life span as a distinct trait. Compensatory adaptation is an important factor in aging, involving a long-lasting adaptation in response to a defect in some organic subsystem. Such adaptation leads to a decrease in viability and possibly to irreversible and life-threatening damage associated with aging.